Transport properties and spin correlations ofLa1.85−xSr0.15+x<

Crystal structure and thermoelectric properties of Sr–Mo substituted CaMnO3: a combined experimental and computational study

“…Later, Bocher et al 16 investigated the thermoelectric properties of CaMn 1– x Nb x O 3 ( x ≤ 0.08). They prepared the ceramics by both conventional mixed oxide and chemical routes; the reported TE data for the mixed oxide samples are in the same range as the data reported by Xu et al 15 However, significantly improved TE properties were reported for the chemically prepared samples; the composition with x = 0.02 showed a ZT value of 0.2 at 900 K, increasing sharply from 0.2 to 0.3 at 1000 K. The main reason for the improved ZT was the remarkable reduction of thermal conductivity of the chemically prepared samples to around 0.8 W m –1 K –1 in the measured temperature range compared to thermal conductivity values of 2.8 W m –1 K –1 at 300 K to 1.5 W m –1 K –1 at 1000 K for the mixed oxide samples.…”

“… 12 – 14 Similarly, an improved power factor has been achieved by B-site substitution with heterovalent cations including Nb, Ta, W, Ru and Mo through introducing Mn 3+ in the matrix. 10 , 15 – 21 In a study of the effect of Nb and Ta, Xu et al 15 reported a lower resistivity and Seebeck coefficient for Nb doping, achieving a ZT of 0.08 at 1000 K for CaMn 0.96 Nb 0.04 O 3 . Later, Bocher et al 16 investigated the thermoelectric properties of CaMn 1– x Nb x O 3 ( x ≤ 0.08).…”

Superconductivity and Elastic Properties of La1.85-1.5xSr0.15+1.5xCu1-xMnxO4 with x = 0, 0.02 and 0.04

“…Previous studies on other 3D transition metal substitution in this system showed increase in a and decrease in c with increasing x, which leads to increase in a/c Wang et al 2006;Xu et al 2004;Zhang & Zhang 2003). The a/c ratio which indicates internal lattice strain has been attributed to characterize the Jahn-Teller distortion of oxygen octahedron around Cu 2+ (Xu et al 2004). The lattice parameters a and c obtained in this study are in good agreement with those reported previously.…”

“…While lattice parameter a did not change in a certain manner, c showed a decrease with increase in substitution level x. Previous studies on other 3D transition metal substitution in this system showed increase in a and decrease in c with increasing x, which leads to increase in a/c Wang et al 2006;Xu et al 2004;Zhang & Zhang 2003). The a/c ratio which indicates internal lattice strain has been attributed to characterize the Jahn-Teller distortion of oxygen octahedron around Cu 2+ (Xu et al 2004).…”

Thermoelectric Ca3Co4O9 ceramics consolidated by Spark Plasma sintering

“…Since the discovery of the thermoelectricity (TE) in the NaCo 2 O 4 phase [1], intensive research has been devoted to discover new oxide materials [2][3][4][5][6][7][8][9], in order to improve potential TE properties [5,[9][10][11][12] and/or to develop TE modules for power generation [13][14][15][16].…”